On Mon, 2 Jul 2012 23:15:08 +0100 Jose Manuel dos Santos Calhariz
<jose.calhariz@netvisao.pt> wrote:

> 
> We have a group of servers with a LVM over a RAID6 of 16 drives.
> During normal work loads, sometimes, the md raid enter on deadlock for
> writes and only a power off/power on allows to recover the machine.

This might be fixed by the following commit which was recently included in
3.5-rc. If could test with that I'd appreciate it.

> 
>   - there is information from "SysRq : Show State", not attached
>     because is too big,

How big is too big?  It is very hard to see if there is anything useful in
there if I cannot see it....

NeilBrown


> 
>   - in attach the output of "iostat -dx 1",
> 
>   - the "avgqu-sz" of the logical volume used for fio tests was
>     76280.00,
> 
>   - in attach the output of "ps ax".
> 
> 
>         Jose Calhariz
> 
> 
> 
>